Refactor notify-send invocation and shell quoting

  * Replace carriage returns with newline characters in multi-line
    notifications.

    D-Bus (via the notifications library) throws an error on input
    containing carriage returns, and notify-send seems to silently
    ignore anything past them.

  * Split the notify-send executable and its switches into separate
    configuration variables.

  * Concatenate the executable and all its arguments before passing
    them to call-process-shell-command, as per the function's
    preferred calling convention.

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